Tourmaline, Paraiba, Brazil, pink
1.84 mm,   E perpendicular c,   unknown composition,  M Taran contributed data
346, 2.8774
347, 2.0926
348, 1.4248
349, 1.1166
350, 0.9486
351, 0.8445
352, 0.7640
353, 0.6963
354, 0.6575
355, 0.6137
356, 0.5753
357, 0.5480
358, 0.5216
359, 0.4997
360, 0.4775
361, 0.4596
362, 0.4450
363, 0.4316
364, 0.4199
365, 0.4083
366, 0.4011
367, 0.3943
368, 0.3853
369, 0.3823
370, 0.3771
371, 0.3750
372, 0.3736
373, 0.3715
374, 0.3708
375, 0.3703
376, 0.3709
377, 0.3716
378, 0.3722
379, 0.3741
380, 0.3767
381, 0.3787
382, 0.3805
383, 0.3825
384, 0.3865
385, 0.3889
386, 0.3926
387, 0.3944
388, 0.3995
389, 0.4025
390, 0.4052
391, 0.4106
392, 0.4144
393, 0.4182
394, 0.4212
395, 0.4251
396, 0.4280
397, 0.4308
398, 0.4345
399, 0.4363
400, 0.4388
401, 0.4405
402, 0.4430
403, 0.4443
404, 0.4462
405, 0.4466
406, 0.4478
407, 0.4479
408, 0.4486
409, 0.4493
410, 0.4497
411, 0.4489
412, 0.4493
413, 0.4491
414, 0.4498
415, 0.4514
416, 0.4495
417, 0.4493
418, 0.4494
419, 0.4496
420, 0.4490
421, 0.4491
422, 0.4502
423, 0.4514
424, 0.4508
425, 0.4530
426, 0.4517
427, 0.4511
428, 0.4526
429, 0.4543
430, 0.4558
431, 0.4574
432, 0.4584
433, 0.4598
434, 0.4622
435, 0.4633
436, 0.4658
437, 0.4682
438, 0.4709
439, 0.4727
440, 0.4762
441, 0.4788
442, 0.4821
443, 0.4855
444, 0.4895
445, 0.4935
446, 0.4987
447, 0.5039
448, 0.5114
449, 0.5211
450, 0.5327
451, 0.5405
452, 0.5472
453, 0.5401
454, 0.5315
455, 0.5303
456, 0.5340
457, 0.5385
458, 0.5442
459, 0.5436
460, 0.5419
461, 0.5448
462, 0.5474
463, 0.5463
464, 0.5500
465, 0.5526
466, 0.5526
467, 0.5549
468, 0.5595
469, 0.5636
470, 0.5672
471, 0.5729
472, 0.5764
473, 0.5787
474, 0.5840
475, 0.5907
476, 0.5967
477, 0.6043
478, 0.6114
479, 0.6201
480, 0.6242
481, 0.6313
482, 0.6367
483, 0.6442
484, 0.6535
485, 0.6635
486, 0.6715
487, 0.6814
488, 0.6929
489, 0.7024
490, 0.7136
491, 0.7228
492, 0.7341
493, 0.7455
494, 0.7568
495, 0.7676
496, 0.7808
497, 0.7948
498, 0.8098
499, 0.8232
500, 0.8379
501, 0.8530
502, 0.8690
503, 0.8813
504, 0.8973
505, 0.9098
506, 0.9254
507, 0.9387
508, 0.9517
509, 0.9687
510, 0.9791
511, 0.9928
512, 1.0060
513, 1.0180
514, 1.0316
515, 1.0428
516, 1.0532
517, 1.0666
518, 1.0783
519, 1.0875
520, 1.0943
521, 1.1047
522, 1.1077
523, 1.1134
524, 1.1173
525, 1.1204
526, 1.1199
527, 1.1208
528, 1.1170
529, 1.1163
530, 1.1152
531, 1.1050
532, 1.0999
533, 1.0922
534, 1.0848
535, 1.0758
536, 1.0626
537, 1.0541
538, 1.0510
539, 1.0392
540, 1.0241
541, 1.0115
542, 0.9986
543, 0.9830
544, 0.9750
545, 0.9672
546, 0.9534
547, 0.9360
548, 0.9226
549, 0.9037
550, 0.8917
551, 0.8754
552, 0.8612
553, 0.8481
554, 0.8368
555, 0.8262
556, 0.8129
557, 0.8022
558, 0.7876
559, 0.7764
560, 0.7651
561, 0.7555
562, 0.7413
563, 0.7319
564, 0.7199
565, 0.7112
566, 0.6997
567, 0.6900
568, 0.6786
569, 0.6699
570, 0.6598
571, 0.6494
572, 0.6394
573, 0.6317
574, 0.6212
575, 0.6119
576, 0.6026
577, 0.5937
578, 0.5857
579, 0.5770
580, 0.5687
581, 0.5614
582, 0.5522
583, 0.5443
584, 0.5376
585, 0.5288
586, 0.5217
587, 0.5139
588, 0.5068
589, 0.5001
590, 0.4942
591, 0.4876
592, 0.4817
593, 0.4758
594, 0.4707
595, 0.4647
596, 0.4591
597, 0.4533
598, 0.4483
599, 0.4440
600, 0.4394
601, 0.4357
602, 0.4334
603, 0.4296
604, 0.4272
605, 0.4233
606, 0.4195
607, 0.4175
608, 0.4165
609, 0.4131
610, 0.4114
611, 0.4098
612, 0.4100
613, 0.4089
614, 0.4084
615, 0.4072
616, 0.4075
617, 0.4073
618, 0.4083
619, 0.4093
620, 0.4089
621, 0.4092
622, 0.4109
623, 0.4134
624, 0.4144
625, 0.4155
626, 0.4175
627, 0.4188
628, 0.4221
629, 0.4244
630, 0.4274
631, 0.4306
632, 0.4327
633, 0.4362
634, 0.4392
635, 0.4423
636, 0.4452
637, 0.4495
638, 0.4527
639, 0.4578
640, 0.4607
641, 0.4649
642, 0.4689
643, 0.4736
644, 0.4770
645, 0.4819
646, 0.4856
647, 0.4910
648, 0.4940
649, 0.4977
650, 0.5023
651, 0.5065
652, 0.5095
653, 0.5152
654, 0.5183
655, 0.5221
656, 0.5269
657, 0.5310
658, 0.5339
659, 0.5381
660, 0.5436
661, 0.5462
662, 0.5496
663, 0.5541
664, 0.5581
665, 0.5611
666, 0.5649
667, 0.5692
668, 0.5720
669, 0.5757
670, 0.5790
671, 0.5822
672, 0.5854
673, 0.5867
674, 0.5917
675, 0.5938
676, 0.5977
677, 0.6003
678, 0.6030
679, 0.6058
680, 0.6082
681, 0.6103
682, 0.6122
683, 0.6132
684, 0.6162
685, 0.6188
686, 0.6204
687, 0.6225
688, 0.6237
689, 0.6270
690, 0.6291
691, 0.6295
692, 0.6295
693, 0.6319
694, 0.6336
695, 0.6339
696, 0.6341
697, 0.6362
698, 0.6366
699, 0.6364
700, 0.6379
701, 0.6393
702, 0.6400
703, 0.6417
704, 0.6403
705, 0.6410
706, 0.6429
707, 0.6431
708, 0.6447
709, 0.6455
710, 0.6445
711, 0.6458
712, 0.6467
713, 0.6478
714, 0.6467
715, 0.6475
716, 0.6494
717, 0.6484
718, 0.6474
719, 0.6491
720, 0.6504
721, 0.6493
722, 0.6510
723, 0.6520
724, 0.6525
725, 0.6526
726, 0.6534
727, 0.6539
728, 0.6550
729, 0.6577
730, 0.6546
732, 0.6531
734, 0.6503
736, 0.6491
738, 0.6488
740, 0.6494
742, 0.6491
744, 0.6486
746, 0.6486
748, 0.6460
750, 0.6475
752, 0.6459
754, 0.6493
756, 0.6493
758, 0.6477
760, 0.6520
762, 0.6533
764, 0.6510
766, 0.6533
768, 0.6533
770, 0.6565
772, 0.6572
774, 0.6578
776, 0.6613
778, 0.6625
780, 0.6659
782, 0.6698
784, 0.6716
786, 0.6749
788, 0.6767
790, 0.6793
792, 0.6846
794, 0.6880
796, 0.6915
798, 0.6981
800, 0.7036
802, 0.7052
804, 0.7133
806, 0.7208
808, 0.7257
810, 0.7317
812, 0.7404
814, 0.7475
816, 0.7571
818, 0.7634
820, 0.7717
822, 0.7832
824, 0.7898
826, 0.8027
828, 0.8112
830, 0.8234
832, 0.8350
834, 0.8481
836, 0.8610
838, 0.8705
840, 0.8869
842, 0.8994
844, 0.9122
846, 0.9257
848, 0.9410
850, 0.9533
852, 0.9671
854, 0.9809
856, 0.9961
858, 1.0084
860, 1.0236
862, 1.0380
864, 1.0565
866, 1.0623
868, 1.0776
870, 1.0901
872, 1.1095
874, 1.1160
876, 1.1295
878, 1.1387
880, 1.1475
882, 1.1613
884, 1.1699
886, 1.1782
888, 1.1928
890, 1.1981
892, 1.2021
894, 1.2076
896, 1.2105
898, 1.2182
900, 1.2229
902, 1.2268
904, 1.2310
906, 1.2269
908, 1.2301
910, 1.2249
912, 1.2216
914, 1.2233
916, 1.2119
918, 1.2080
920, 1.2042
922, 1.2022
924, 1.1937
926, 1.1863
928, 1.1759
930, 1.1637
932, 1.1589
934, 1.1410
936, 1.1329
938, 1.1199
940, 1.1085
942, 1.0971
944, 1.0870
946, 1.0689
948, 1.0544
950, 1.0412
952, 1.0313
954, 1.0159
956, 0.9999
958, 0.9907
960, 0.9763
962, 0.9626
964, 0.9467
966, 0.9360
968, 0.9253
970, 0.9125
972, 0.8984
974, 0.8886
976, 0.8792
978, 0.8713
980, 0.8609
982, 0.8516
984, 0.8417
986, 0.8333
988, 0.8252
990, 0.8191
992, 0.8111
994, 0.8046
996, 0.7959
998, 0.7907
1000, 0.7864
1002, 0.7798
1004, 0.7752
1006, 0.7689
1008, 0.7605
1010, 0.7494
1012, 0.7435
1014, 0.7339
1016, 0.7272
1018, 0.7255
1020, 0.7219
1022, 0.7168
1024, 0.7068
1026, 0.6945
1028, 0.6879
1030, 0.6836
1032, 0.6753
1034, 0.6751
1036, 0.6689
1038, 0.6651
1040, 0.6686
1042, 0.6563
1044, 0.6469
1046, 0.6411
1048, 0.6493
1050, 0.6352
1052, 0.6276
1054, 0.6275
1056, 0.6222
1058, 0.6217
1060, 0.6201
1062, 0.6094
1064, 0.6080
1066, 0.6056
1068, 0.5996
1070, 0.5927
1072, 0.5898
1074, 0.5941
1076, 0.5916
1078, 0.5818
1080, 0.5854
1082, 0.5812
1084, 0.5773
1086, 0.5756
1088, 0.5808
1090, 0.5702
1092, 0.5602
1094, 0.5660
1096, 0.5589
1098, 0.5480
1100, 0.5412
1102, 0.5452
1104, 0.5447
1106, 0.5378
1108, 0.5348
1110, 0.5295
1112, 0.5282
1114, 0.5245
1116, 0.5231
1118, 0.5188
1120, 0.5165
1122, 0.5176
1124, 0.5108
1126, 0.5048
1128, 0.5080
1130, 0.4995
1132, 0.4965
1134, 0.4968
1136, 0.4947
1138, 0.4838
1140, 0.4863
1142, 0.4799
1144, 0.4779
1146, 0.4789
1148, 0.4721
1150, 0.4708
1152, 0.4702
1154, 0.4623
1156, 0.4557
1158, 0.4531
1160, 0.4570
1162, 0.4517
1164, 0.4449
1166, 0.4503
1168, 0.4422
1170, 0.4356
1172, 0.4394
1174, 0.4351
1176, 0.4280
1178, 0.4325
1180, 0.4224
1182, 0.4222
1184, 0.4194
1186, 0.4191
1188, 0.4141
1190, 0.4139
1192, 0.4097
1194, 0.4099
1196, 0.4071
1198, 0.4002
1200, 0.3975
1202, 0.4026
1204, 0.3944
1206, 0.3974
1208, 0.3917
1210, 0.3886
1212, 0.3860
1214, 0.3847
1216, 0.3832
1218, 0.3795
1220, 0.3747
1222, 0.3703
1224, 0.3696
1226, 0.3734
1228, 0.3668
1230, 0.3646
1232, 0.3645
1234, 0.3588
1236, 0.3625
1238, 0.3598
1240, 0.3626
1242, 0.3534
1244, 0.3566
1246, 0.3567
1248, 0.3542
1250, 0.3515
1252, 0.3454
1254, 0.3441
1256, 0.3465
1258, 0.3418
1260, 0.3401
1262, 0.3369
1264, 0.3334
1266, 0.3350
1268, 0.3333
1270, 0.3278
1272, 0.3280
1274, 0.3305
1276, 0.3245
1278, 0.3241
1280, 0.3235
1282, 0.3303
1284, 0.3288
1286, 0.3253
1288, 0.3221
1290, 0.3220
1292, 0.3209
1294, 0.3248
1296, 0.3260
1298, 0.3148
1300, 0.3189
1302, 0.3133
1304, 0.3135
1306, 0.3132
1308, 0.3100
1310, 0.3117
1312, 0.3041
1314, 0.3057
1316, 0.3053
1318, 0.3038
1320, 0.2981
1322, 0.3025
1324, 0.2955
1326, 0.2947
1328, 0.2949
1330, 0.2910
1332, 0.2908
1334, 0.2865
1336, 0.2866
1338, 0.2846
1340, 0.2844
1342, 0.2814
1344, 0.2853
1346, 0.2807
1348, 0.2832
1350, 0.2789
1352, 0.2849
1354, 0.2820
1356, 0.2805
1358, 0.2794
1360, 0.2784
1362, 0.2818
1364, 0.2816
1366, 0.2790
1368, 0.2770
1370, 0.2808
1372, 0.2777
1374, 0.2809
1376, 0.2876
1378, 0.2875
1380, 0.2947
1382, 0.2994
1384, 0.2972
1386, 0.2992
1388, 0.2941
1390, 0.2907
1392, 0.2867
1394, 0.2873
1396, 0.2945
1398, 0.2957
1400, 0.3013
1402, 0.3044
1404, 0.3014
1406, 0.2912
1408, 0.2867
1410, 0.2812
1412, 0.2795
1414, 0.2804
1416, 0.2815
1418, 0.2865
1420, 0.2909
1422, 0.2953
1424, 0.3155
1426, 0.3399
1428, 0.3644
1430, 0.3762
1432, 0.3600
1434, 0.3416
1436, 0.3096
1438, 0.3049
1440, 0.3016
1442, 0.2930
1444, 0.2946
1446, 0.2910
1448, 0.2923
1450, 0.2893
1452, 0.2911
1454, 0.2903
1456, 0.2961
1458, 0.2883
1460, 0.2935
1462, 0.2873
1464, 0.2947
1466, 0.2929
1468, 0.2898
1470, 0.2890
1472, 0.2854
1474, 0.2876
1476, 0.2869
1478, 0.2844
1480, 0.2893
1482, 0.2870
1484, 0.2946
1486, 0.2870
1488, 0.2910
1490, 0.2849
1492, 0.2887
1494, 0.2852
1496, 0.2851
1498, 0.2800
1500, 0.2799
1502, 0.2820
1504, 0.2841
1506, 0.2804
1508, 0.2772
1510, 0.2856
1512, 0.2753
1514, 0.2744
1516, 0.2695
1518, 0.2763
1520, 0.2736
1522, 0.2667
1524, 0.2702
1526, 0.2692
1528, 0.2749
1530, 0.2644
1532, 0.2663
1534, 0.2626
1536, 0.2752
1538, 0.2660
1540, 0.2669
1542, 0.2664
1544, 0.2641
1546, 0.2641
1548, 0.2634
1550, 0.2649
1552, 0.2685
1554, 0.2677
1556, 0.2643
1558, 0.2679
1560, 0.2664
1562, 0.2631
1564, 0.2612
1566, 0.2667
1568, 0.2644
1570, 0.2656
1572, 0.2711
1574, 0.2693
1576, 0.2644
1578, 0.2675
1580, 0.2652
1582, 0.2621
1584, 0.2656
1586, 0.2708
1588, 0.2672
1590, 0.2651
1592, 0.2684
1594, 0.2583
1596, 0.2593
1598, 0.2576
1600, 0.2574
1602, 0.2601
1604, 0.2569
1606, 0.2545
1608, 0.2537
1610, 0.2596
1612, 0.2557
1614, 0.2569
1616, 0.2502
1618, 0.2613
1620, 0.2577
1622, 0.2613
1624, 0.2521
1626, 0.2495
1628, 0.2549
1630, 0.2532
1632, 0.2533
1634, 0.2544
1636, 0.2556
1638, 0.2589
1640, 0.2557
1642, 0.2598
1644, 0.2647
1646, 0.2561
1648, 0.2607
1650, 0.2502
1652, 0.2479
1654, 0.2532
1656, 0.2591
1658, 0.2533
1660, 0.2505
1662, 0.2478
1664, 0.2514
1666, 0.2516
1668, 0.2515
1670, 0.2503
1672, 0.2489
1674, 0.2529
1676, 0.2414
1678, 0.2496
1680, 0.2462
1682, 0.2422
1684, 0.2462
1686, 0.2403
1688, 0.2416
1690, 0.2499
1692, 0.2545
1694, 0.2549
1696, 0.2525
1698, 0.2564
1700, 0.2591
1702, 0.2629
1704, 0.2593
1706, 0.2569
1708, 0.2635
1710, 0.2568
1712, 0.2566
1714, 0.2608
1716, 0.2592
1718, 0.2628
1720, 0.2653
1722, 0.2705
1724, 0.2676
1726, 0.2681
1728, 0.2698
1730, 0.2650
1732, 0.2679
1734, 0.2605
1736, 0.2650
1738, 0.2677
1740, 0.2723
1742, 0.2637
1744, 0.2643
1746, 0.2703
1748, 0.2658
1750, 0.2675
1752, 0.2609
1754, 0.2687
1756, 0.2622
1758, 0.2645
1760, 0.2697
1762, 0.2681
1764, 0.2601
1766, 0.2699
1768, 0.2697
1770, 0.2757
1772, 0.2582
1774, 0.2698
1776, 0.2685
1778, 0.2740
1780, 0.2732
1782, 0.2788
1784, 0.2650
1786, 0.2777
1788, 0.2828
1790, 0.2824
1792, 0.2801
1794, 0.2767
1796, 0.2835
1798, 0.2869
1800, 0.2874
1810, 0.2848
1820, 0.2805
1830, 0.2848
1840, 0.2885
1850, 0.2870
1860, 0.2902
1870, 0.2915
1880, 0.2997
1890, 0.3080
1900, 0.3286
1910, 0.3566
1920, 0.3848
1930, 0.4076
1940, 0.4037
1950, 0.3962
1960, 0.3861
1970, 0.3765
1980, 0.3644
1990, 0.3533
2000, 0.3459
2010, 0.3414
2020, 0.3422
2030, 0.3501
2040, 0.3556
2050, 0.3705
2060, 0.3711
2070, 0.3723
2080, 0.3790
2090, 0.3851
2100, 0.3846
2110, 0.3870
2120, 0.3801
2130, 0.3920
2140, 0.4020
2150, 0.4299
2160, 0.5349
2170, 0.7862
2180, 0.8516
2190, 0.7174
2200, 0.7544
2210, 1.1317
2220, 0.8057
2230, 0.6639
2240, 0.8382
2250, 1.0621
2260, 1.0598
2270, 0.7328
2280, 0.5736
2290, 0.5982
2300, 0.8687
2310, 1.1301
2320, 0.8379
2330, 0.6142
2340, 0.5190
2350, 0.4983
2360, 0.5074
2370, 0.5412
2380, 0.6040
2390, 0.6669
2400, 0.7249
2410, 0.7914
2420, 0.7894
2430, 0.8231
2440, 0.8082
2450, 0.8467
2460, 0.9101
2470, 0.8907
2480, 0.9637
2490, 1.0160
2500, 1.0235